Can't create Group because it contains multiple copies of same Group.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)

Syntax

C#
public static FailureDefinitionId GroupsHasCycle { get; }
Visual Basic
Public Shared ReadOnly Property GroupsHasCycle As FailureDefinitionId
	Get
Visual C++
public:
static property FailureDefinitionId^ GroupsHasCycle {
	FailureDefinitionId^ get ();
}

See Also